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"I appreciate your guards can't actively police them, but they could announce which carriages they are, but there's always someone shouting into their phone and you can gesture to them and point at the sign. It usually works."

The first Intercity Express Train for Great Western Railway (GWR) arrives in Plymouth Train Station for the first time

Clive Strong added: "If it is being enforced, they should stay.

"The problem is a good number of people don't care about anyone else except themselves and make calls, blast out music etc."

Twitter user ClaireQueen said: "I always head straight for the quiet zone. It's nice knowing I don't have to listen to others music and conversions. #KeepTheQuietZone"